Motor Innervation

Skeletal muscle fibers are richly innervated by motor neurons that originate in the spinal cord or brain stem. The axons of the neurons branch as they near the muscle, giving rise to twigs or terminal branches that end on individual muscle fibers (Fig. 10.8).

The neuromuscular junction is the contact made by the terminal branches of the axon with the muscle

At the neuromuscular junction (motor end plate), the myelin covering (myelin sheath) of the axon ends, and the terminal portion of the axon is covered by only a thin portion of the neurilemmal (Schwann) cell and its external lamina. The end of the axon ramifies into a number

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